As with any topic, there are many helpful sources of information about conducting online research on the Internet. Do your own search on "conducting online research."
Here are a few resources to boost your confidence in locating quality research sources:
Use a Scholarly Search Engine
Some search engines index and cite only journals and scholarly research articles from well-regarded sources.
Google Scholar is indexed to journal and research sources
Scirus is indexed to scientific journals, government organizations, and research institutions
PLOS or the Public Library of Science is a non-profit group that makes scientific articles and papers publicly available
RefSeek is a web search engine that aims to make academic information easily accessible to everyone
The United States Library of Congress is a huge collection and good place to get started in searching for well-sourced information
Distinguishing Scholarly Journals from Other Periodicals
Many journals, newspapers, and magazines are available online. Cornell University librarians provide tips for selecting scholarly articles and substantive news articles in these two 90-second videos:
How to Identify Scholarly Journal Articles
How to Identify Substantive News Articles
Using Primary Sources on the Web
Many original historical documents – including maps, photos, letters, out-of-print books – have been digitized and placed on the Internet. This short guide from the American Library Association provides strategies for authenticating copies of originals: